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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3db14073596c7f43db5b21afbd50c094e696c101ba5ffc2ba8a7462f73decb3' 
  AND token = '1cRjah2F1BOl7W7fknwYafc11p4lJ2bToMrV6LA7I8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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