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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859f744b30d185768f44e16d34c5b96e4d505f78b3cb69b7093ff33723371865' 
  AND token = '1944/wDRWro8Q4nriBYTQ5kE+Q2Pus2QlFUx4I7XTPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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