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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2555eaa706210bcb696c3ab6b2822e63778885c6a202fac1f7509ebb8d756018' 
  AND token = 'us6lZLM0gvMDV8tJXlqPuRfRaJO7B8tlW98az+ZKxg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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