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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe14af1678fd99f35c0be6ef6251ed2e4e262fbfa714c98420d6bc4f5b0c184c' 
  AND token = 'rGYB7LMiYs7m1GvB4ms/L2mNwcEs0As7x/0oE+U9EK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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