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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7141eaf7bb88a9f04b01091a4ab36a986588f1c8fc9ce9711613fb13100ae8f' 
  AND token = 'eohjcuocp+Fot0Rmd5T74c0sdZxo/DTk3qdPcZS9AB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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