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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c303aeb09bfbfd2920129b9bf683a467659094f8100f6f1e1c47ba8e7a89fd1c' 
  AND token = 'DFTdcXvtydkba3j/M4I1bg7qlT2ztd65mM7ZfdDYhfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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