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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6cd388fc7c559bc5677ad8d10cebd1a48602b7036ec0df4b74bc5ffb2cb5acf' 
  AND token = 'qo4sflDWdUVz9c4cCR5YCh+UaRZX23GQrWu7Jxw+k5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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