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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a249342197acba30b5048acf9535e6e1193c951d02f00513979d137bf0c43db6' 
  AND token = '3VWhpT0+CEidy1wfEFOPiJINPZYMOH99F1+N/7SrRPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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