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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb244c9c9d481fca6e3a000757c99e72d540a05b485d4aa6bf8b2a4aa92696f' 
  AND token = 'vM3giRq+b5vy0kCFHrmDHQ4AgtNaP7wAmuPeuITpTfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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