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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9f8a0840b48e9e5fcbc7eb770a9e81f444801aedae4fcbbd459801285c4f00' 
  AND token = '7YNu42GFwRwLmedmVU4xWefe3JmdM+I63TciHPVCcZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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