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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60af671afba19fe6f629b7ed6b49c34a33a1ac15ae8988cfbfe24fa96b94033' 
  AND token = 'IYFDG59JbH85uTf4AsqW+OLNu9UL88vjKvu7clHYIbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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