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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52e997ba0189b893aaeed789e823643bc25473cbddcf5785672262929978ed85' 
  AND token = 'UhSz03vmEke8HZgwwfEZrobhpOO6wpPf8jpXh40oeYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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