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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9348db54a77aa93786ee9384d35956dcd2ef4c95b65277db17e2243a69d70f17' 
  AND token = '9hfRFG5EI8uT5eGd+9HLB5XoyH761bS8K/a5no5xP/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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