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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73fcc82ca794b6b3225a6f121b3b26151bbfe2d27ac07b5e5331804b5e6dca69' 
  AND token = '64eBNrJBxNof7WkcGrsO3e9YqrPkFQ3vhy5/F+5P0sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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