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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a17baa7efe6676c387748022440a5278f20d0fb44386bad229c13d3c5a710e3' 
  AND token = 'sEsU5ub1jlRQP4eFBHm6XHG+JCmvlNSWiI4spge61iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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