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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7ce626e36ba4e979f909f17b1f2655322c9e186756d772759a81f7b4c427c7' 
  AND token = 'hwXv1YLioyFpyG9DADTnzwOQ0lMBzKaNf111i+9fLA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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