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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ba67553ec47c65da6c05bad4d73c8ca268fe70c38ee103fd43b198154077b6' 
  AND token = '+/FyKpIV3cGXrvzQgKAFckiXkMnuUarN501ru/WoFCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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