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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '818d5d4802f1e441a35127899aadbdbd567aa4fb13f1a1539322aa653f90b6c0' 
  AND token = '/7k+QRNK/JiBmH3Sxm3T20ooyx+f36zyc9GopBVzr20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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