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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb18f6698177d0002d3b854b7842a9891d4e47496404c318a1b1c2a94d06f3b4' 
  AND token = 'L394TGPQNC7rjkDSbzaqNu6f2jVGfjLbD63b7e1oef8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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