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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd294a521dff43f2223b7a37a1282cb836985ebc0af33ee88506c19fb9a7e47' 
  AND token = 'm5nHqxye8d0/WF0Z5JWg/4NNoCKrGMeX1w6Edza/NDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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