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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc4427a1d969b309fd8f819fa1084f7c7efcb19d3a81543245e73fa374b56cc' 
  AND token = 'EQxXU229IdK5fNIhb28b4lX9WVHScIuuk45x6Rj+iBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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