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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ed2954e512d5d9dca84e56baa9635f34746bc1c787707c35edc97e26bfcc03' 
  AND token = 'R99jerpntqjwREONmmaSsWj0JpEgEGka08Sl5CZpCVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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