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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8b2736b69ca06537b7c09f0cf351534fc87cabc4549887a24b721c4a12fdf4' 
  AND token = '5+srz69ubqX+vqHRvnuM6l6eMYKlS2COtyCthYyat0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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