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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6b8c8f5035ee4e2ec330b4001da8124f4481a144e1e58cd8f1058719b106fb' 
  AND token = 'KYOt/lqJxN8EWgeOD9AZBdOhAA/VjnSKvFb7/YyJsK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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