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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca1f44b3395efb78e8f46134a2c0aa1d9a041a788070dd1d5df1194f0358008' 
  AND token = 'kCTqLFCv3On1/YIxhssopy/jF+9C8qLkwMKoeWAkd7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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