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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2056d9be120e470fc3e063e4e0c067e2caa2ba8df9ae59aa7541146ef04bdd5' 
  AND token = 'arqsl/qc3jIxEBT1VTOpGsvLycMuwwHNciWUbFY4qIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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