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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5da9c3c014164bd59d99b47dacd823bd11eaa743a725ed7e5aaacec7faae36c' 
  AND token = 'q9STgp/r8g5bQFALDw8F0DFtsBQommXj5J1e1ycN0wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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