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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c85306b43ae15b446a38a66d2920b6394b4052c246abbf157db5e1770016302' 
  AND token = 'pdwYCHjrFbcKjJGL62kc/5g7cc1wHGs3pwha6h8wteU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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