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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64706b26b7ad5ed2cef04795b2a7d5ee3c70cf32ef5342e96a0fa260b6342de4' 
  AND token = 'Yl4n/dD3cj+e9p8s18WJqbyle0wojlicnhJwBqsemXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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