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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112d20d4e76939d853877c787f81b8d8ec70e2d8e6f8a37f296da6f23dea7cb0' 
  AND token = '2NCz5C98YrPSd+h0DL42rChUGg2Y2d7TCvuU7KOeziw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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