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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a05c551614783934dd3c94667508d1d1e2628edcb428570642d37bfaafb672b' 
  AND token = '2HattFnQm+7iK2h95U9HTZnZxgKfw4miOeYabFVgHD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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