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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a2a28807ff0a35d754ba0eb2a6fb4b2ba78038d2b49c78e210893545505acc' 
  AND token = 'gmFsbndzf1HADMns5tCIZco2Cq96pK+DuwiJ0Swcaf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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