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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d04fee4e65fe67cf4fff0d244199905c38393300afbb2a478c4f2ad30874ebb' 
  AND token = 'HQgeHJZoFHzG1e9il3E7svxJv+M6SrjfjXgXG9c4Xm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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