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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9094e8bd859f26dde919d6e6c6140f1e117cdd91be46dc830159fcb74362798e' 
  AND token = 'DoLLvM4Mww5SYSoDT4Tdi8LnxqACBfCvuAMx3LOT0dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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