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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e9e2890097ef14bdc100b511e6ab783b1932b6e2b7e2764adc499be2ada5c0b' 
  AND token = 'IAsxzFkgTmiy5r3MoDIDFEPrtBjm8gKxOv0qc975XRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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