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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a8beec30e4a56c46ceaa3230f2137c0b940b4df2c3409d27afd0eb26317514' 
  AND token = 'EWKzKQZWe2yV43lQXzho66bWOfH8c482d1flDd5ef20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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