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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3cafecc2a3adf0a314e47b2183de04917f9677bd8bff6479bd198a897042f8' 
  AND token = 'ss3mnmrgTZKP7hPheQgvrnONLH3+EZren53YmzbgJLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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