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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947feacba9fd73b86829cccb354d334cabe08a623131076b00a8c64f1fa6a014' 
  AND token = 'cubZ9g9nNRYjbcHQ/LEmbCVcJ8GPTDopOPAXFXVq2Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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