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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b5aa8666ff8ae472e57e9af7c052cc8d3679478abe95bfbf32c5a1254839db0' 
  AND token = 'OmDIUzjlJijgmv5h4e87b958DXyJwjpY2OhAOmrRxl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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