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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229340305b358ccc8766a84331b1a0d2d1255819413b5eb21505ae136f52ced2' 
  AND token = 'rnca7nboLci8wwKRI5YXlql7x1aRgV9WeMs5lC+mL+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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