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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89c684b98d26010f5c4c6979895c498433ab2a2d400f9d0d3be20f2a682ebb9' 
  AND token = 'dBOp7OH9A339GgYhlCSIgpeKbByScpowpZBBUZbCL6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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