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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e2a7112815662ac130a94b263aa87bb9845983332ac7c6555d1737bf3e5a052' 
  AND token = '97l9DoyzDWoOYmOg0anJSPZIFwarL2Tu7hs42WHobWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}