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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f60b2a793e35f413857d59fb49404b3b7acb8bc9460a677f17ca7669fb7ab5' 
  AND token = '0vSY4J9TD9LNxY9JL1aW7Wl8yKYTLAXinavuE03komY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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