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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caee53cbda488eef58209482e22a73e9e75a2bacd1c9de119dcea681273425bd' 
  AND token = 'YigLSqzD/x2UKTwt5vRZ+r0Vybzeh2nZ6xi7SFtrWjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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