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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7fd493e732930966fd12371779a9aa94b9123bd3521da572f47ddc2c3b42ea1' 
  AND token = 'ebzbO51neYTAfZfOu5soqNj++iuYONKK4uFOHm+DlfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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