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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29719e8bb015666ddcfbb604064879deb3ad0fe4ce7846db70dd0622f5497e0c' 
  AND token = 'keVCVJA0veJo1eS/aGgtJTE0Kx5H5IKrbLi/WDhAOnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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