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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e87b65aa4a827f43ee0c176c0bf62310af2cdcc3b7befd9dffbee12958d65d1' 
  AND token = 'RiwqZ0kdN9pPIEbtgsrJOKKSYiqwTBXsIqJDKTxB5zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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