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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0dd1915670027c0f3e624fe66a622637758e115300fed1703d4abe9215c21e' 
  AND token = 'a8/v3bbXsWgGpDi7J1PYafXXgP1Va3v+BtD/mYb42+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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