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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4777f9873055358ec23c38edda3db5fd58509c2be5791a28d61772b3fdbac742' 
  AND token = '5Jy0N6I8dMRf4AXcj3NzK5AtTa/wg00imA9AhejBHWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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