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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a89e185dd9a80aac8839e08c64212c5397a39b10e8df6f9a8eb7570cdca6d11' 
  AND token = '4wH+Ay5I7p/0cWMkVW3cK5EradFxFwST96H7G/bGxIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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