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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd7f389ab9637d3e8e2b9b6d0c3c0edf63de98daa026d79e2d825f1c1be8cf2' 
  AND token = 'G9LEm71raT/fgn+nqZpG2kGkL2Wk1V1kLP4kfThDANg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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