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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba557ae1fdae828f662d7385546d812fa5dc38d17bba986f8b20fc8638866e6' 
  AND token = 'pVi8QZ70WJvpaiSdz1tSRaN+KuwdA3lJUTOK7tsn3Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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