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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee04a36fa9ad0b6f0c4114e3720398c0a15667b2e3be530c71dd004b59faf3c' 
  AND token = 'cbyPNtt+QBjubvkQmCwhhysmnUSIBF/z8TkQmd6AKTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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