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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3e7487e4bbd6c16bbabe77f8b8b0693e9b13bc862ea8d7b23dd4d2b75b1461' 
  AND token = 'u5iFMHGuGf+58W5saci4YuCTOfHyn1BPS156HRAo+C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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