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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0147773954ad275d6d1f6467c8e9fd78d78d502b578391a1dd5acd8b855456' 
  AND token = 'aR6Jq0zmKNX6OUhtvux2jQb38N9HNWcaxMz697wc++M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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