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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3bcf7db6b2aee1494ff3e6955b9f090df02d3758f1923f5a0ab315e56055cdb' 
  AND token = '6MBojeVWoLkbVwqln04WIi2tv3j/cZiLeN0RyqZ4XZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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